Register ntp_tiles preferences on iOS.

BUG=631990

Review-Url: https://codereview.chromium.org/2316503003
Cr-Commit-Position: refs/heads/master@{#416631}
diff --git a/ios/chrome/browser/BUILD.gn b/ios/chrome/browser/BUILD.gn
index 35c4faf..0a7540b 100644
--- a/ios/chrome/browser/BUILD.gn
+++ b/ios/chrome/browser/BUILD.gn
@@ -649,6 +649,7 @@
     "//components/network_session_configurator",
     "//components/network_time",
     "//components/ntp_snippets",
+    "//components/ntp_tiles",
     "//components/omnibox/browser",
     "//components/open_from_clipboard",
     "//components/password_manager/core/browser",